Instruction 32- subtraction with carry – Maple Systems MAPware-7000 User Manual
Page 67
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MAPware-7000 Ladder Logic Guide
1010-1041 rev. 00
Instruction 32- Subtraction with carry
Expression:
Space Requirement: 1 line x 6 column Location Requirement: Middle, Right rail
Function:
When the input is ON, the data of B and the carry flag (CF = S976) are subtracted from A, and
the result is stored in C. If a borrow occurs in the operation, the carry flag is set to ON. If the
result is greater than 32767 or smaller than -32768, the output is turned ON.
This instruction is used to perform unsigned subtraction or double-length subtraction.
Execution Condition:
Input
Operation
Output
ERF
OFF
No execution
OFF
---
Normal
No Borrow
OFF
Reset
ON
Execution
Borrow Occurred
OFF
Set
Overflow/
No Borrow
ON
Reset
Underflow Borrow Occurred
ON
Set
Operand:
Coil or Bit
Register
Constant
Index
Name
X
Y B
S
T.
C.
M
X
W
Y
W
B
W
S
W
T C
D
I
J
K
M
W
A
Minuend
√
√
√
√
√ √
√
√
√
√
√
√
B
Subtrahend
√
√
√
√
√ √
√
√
√
√
√
√
C
Difference
√
√
√
√ √
√
√
√
√
√
Example: